CN101546907B - Electrostatic protection circuit and active-element array substrate - Google Patents
Electrostatic protection circuit and active-element array substrate Download PDFInfo
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- CN101546907B CN101546907B CN2008100879653A CN200810087965A CN101546907B CN 101546907 B CN101546907 B CN 101546907B CN 2008100879653 A CN2008100879653 A CN 2008100879653A CN 200810087965 A CN200810087965 A CN 200810087965A CN 101546907 B CN101546907 B CN 101546907B
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Abstract
The invention discloses an electrostatic protection circuit, which is electrically connected with a first wire and a second wire. The electrostatic protection circuit has a first electrostatic protection circuit unit, wherein the first electrostatic protection circuit unit comprises a first active element, a second active element and a third active element. The first active element comprises a first source electrode, a first drain electrode and a first grid, wherein the first source electrode and the first grid are electrically connected to the first wire. The second active element comprises a second source electrode, a second drain electrode and a second grid, wherein the second grid is electrically connected with the first wire, the second source electrode is electrically connected with the first drain electrode while the second drain electrode is electrically connected with an electrostatic output terminal. The third active element comprises a third source electrode, a third drain electrode and a third grid, wherein the third source electrode is electrically connected with the first drain electrode and the second source electrode, while the third drain electrode and the third grid are electrically connected with the second wire. Therefore, the electrostatic conduction efficiency of the electrostatic protection circuit can be effectively promoted.
Description
Technical field
The invention relates to a kind of active elements array substrates, and particularly relevant for a kind of have static discharge (electrostatic discharge, ESD) protection effect active elements array substrates.
Background technology
In the manufacture process of LCD, all may have static in operating personnel, board, detecting instrument or the processing procedure, and above-mentioned electrified body (operating personnel, board or detecting instrument) may cause element and circuit in the display panels destroyed by static discharge (electrostaticdischarge) when touching display panels.Therefore, generally can in the perimeter circuit district of display panels, design electrostatic discharge protection circuit.With the active matrix liquid crystal display floater, normally in the process of making active device array, in the lump electrostatic discharge protection circuit is formed on the substrate, and active device array and these electrostatic discharge protection circuits are electrically connected.Thus, when display panels was impacted by static discharge, electrostatic discharge protection circuit can be with electrostatic dispersion, weaken, and directly impacted the element and the circuit of inside, viewing area to avoid static.
Figure 1A is the schematic diagram of existing active elements array substrates.Please refer to Figure 1A, active elements array substrates 110 has a viewing area A and a perimeter circuit district B, and active elements array substrates 110 mainly is by a substrate 112, multi-strip scanning line 114, many data wires 116, a plurality of pixel cell 118, a short-circuit rods 120, a plurality of electrostatic discharge protection circuit 122 and 124 formations of a plurality of connection pads (Pad).Wherein, scan line 114 is disposed on the substrate 112 with data wire 116, and pixel cell 118 is disposed in the A of viewing area.Particularly, scan line 114 is electrically connected to pixel cell 118 with data wire 116, and voltage signal can be passed in the pixel cell 118 by scan line 114 and data wire 116.In addition, scan line 114 and data wire 116 electrically connect with corresponding connection pad 124 respectively.
By Figure 1A as can be known, short-circuit rods 120 is disposed in the perimeter circuit district B, and electrically connects with an end of electrostatic discharge protection circuit 122.The other end of electrostatic discharge protection circuit 122 can electrically connect with corresponding scanning line 114 and data wire 116 respectively.Particularly, when the static discharge phenomenon took place on substrate 112, electrostatic charge can be disperseed by short-circuit rods 120, to avoid electrostatic charges accumulated.On the other hand, electrostatic discharge protection circuit 122 can consume the energy of electrostatic charge to lower the impact of static discharge.
Figure 1B is a kind of electrostatic discharge protection circuit schematic diagram that the TaiWan, China patent discloses for TWI268597 number.Please refer to Figure 1B, electrostatic discharge protection circuit 200 electrically connects holding wire 210 and short-circuit rods 220, electrostatic discharge protection circuit comprises the first active element T1, the second active element T2, the 3rd active element T3, having ideals, morality, culture, and discipline source elements T 4, the 5th active element T5, the 6th active element T6, and each active element T1, T2, T3, T4, T5, T6 have corresponding grid G, source S and drain D.Shown in Figure 1B, the first active element T1, the second active element T2 and the 3rd active element T3 constitute positive electrostatic defending group 230, the having ideals, morality, culture, and discipline source elements T 4, the 5th active element T5 and the 6th active element T6 and constitute negative electrostatic defending group 240.When the static discharge phenomenon took place, electrostatic charge can be done the two-way dispersion of dredging with electrostatic charge, to avoid electrostatic charges accumulated via positive electrostatic defending group 230 or negative electrostatic defending group 240.On the other hand, electrostatic discharge protection circuit 200 can consume the energy of electrostatic charge to lower the impact of static discharge.
Fig. 1 C is existing another kind of electrostatic discharge protection circuit schematic diagram.Please refer to Fig. 1 C, electrostatic discharge protection circuit 250 electrically connects holding wire 260 and short-circuit rods 270, and electrostatic discharge protection circuit 250 comprises the first active element T1 and the second active element T2, and each active element T1, T2 have corresponding grid G, source S and drain D.Shown in Fig. 1 C, make that the first active element T1 is positive electrostatic defending group 280, and the second active element T2 is negative electrostatic defending group 290.When the static discharge phenomenon took place, electrostatic charge can be done the two-way dispersion of dredging with electrostatic charge, to avoid electrostatic charges accumulated via positive electrostatic defending group 280 or negative electrostatic defending group 290.On the other hand, electrostatic discharge protection circuit 250 can consume the energy of electrostatic charge to lower the impact of static discharge.
Yet generally speaking, the electrostatic conducting size of current of electrostatic discharge protection circuit is subjected to the influence of the breadth length ratio value (W/L) of active element deeply, for example above-mentioned electrostatic discharge protection circuit 200 or above-mentioned electrostatic discharge protection circuit 250.Therefore, in order to increase the electrostatic protection effect of electrostatic discharge protection circuit, can increase the breadth length ratio value of active element usually on the practice,, and then increase the efficient that static is dredged so that electrostatic discharge protection circuit has higher electrostatic conducting electric current.Can increase the electrostatic conducting electric current though it should be noted that the breadth length ratio value that increases active element, will occupy bigger circuit layout area, thereby limit the arrangement space of other circuit on the active elements array substrates.On the other hand, under the low-voltage of normal running, the breadth length ratio value of active element is big more, and the leakage current of electrostatic discharge protection circuit is then big more, and then influences the normal demonstration of display panels.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of electrostatic discharge protection circuit, have low-leakage current and dwindle the layout area advantage.
For specifically describing content of the present invention, at this a kind of electrostatic discharge protection circuit is proposed, it is electrically connected to one first lead and one second lead, electrostatic discharge protection circuit has one first electrostatic discharge protection circuit unit, and wherein the first electrostatic discharge protection circuit unit comprises first active element, second active element and the 3rd active element.First active element comprises first source electrode, first drain electrode and the first grid, and wherein first source electrode and first grid are electrically connected to first lead.Second active element comprises second source electrode, second drain electrode and the second grid, and wherein second grid is electrically connected to first lead, and second source electrode is electrically connected to first drain electrode, and second drain electrode is electrically connected to the static output.The 3rd active element comprises the 3rd source electrode, the 3rd drain electrode and the 3rd grid, and wherein the 3rd source electrode is electrically connected to first drain electrode and second source electrode, and the 3rd drain electrode is electrically connected to second lead with the 3rd grid.
The present invention proposes a kind of active elements array substrates in addition, have a viewing area and be positioned at a perimeter circuit district outside the viewing area, this active elements array substrates comprises substrate, a plurality of pixel cell, many first leads, many second leads and a plurality of electrostatic discharge protection circuit.A plurality of pixel unit array are arranged on the substrate, and are positioned at the viewing area.Many first conductor configurations and are positioned at the viewing area on substrate, first lead and pixel cell electrically connect, and extend to the perimeter circuit district.Many second conductor configurations and are positioned at the perimeter circuit district on substrate.A plurality of electrostatic discharge protection circuits are disposed on the substrate, and be positioned at the perimeter circuit district, electrostatic discharge protection circuit is electrically connected to first lead and second lead, each electrostatic discharge protection circuit has one first electrostatic discharge protection circuit unit, and wherein each first electrostatic discharge protection circuit unit comprises first active element, second active element and the 3rd active element.First active element comprises first source electrode, first drain electrode and the first grid, and wherein first source electrode and first grid are electrically connected to first lead.Second active element comprises second source electrode, second drain electrode and the second grid, and wherein second grid is electrically connected to first lead, and second source electrode is electrically connected to first drain electrode, and second drain electrode is electrically connected to second lead.The 3rd active element comprises the 3rd source electrode, the 3rd drain electrode and the 3rd grid, and wherein the 3rd source electrode is electrically connected to first drain electrode and second source electrode, and the 3rd drain electrode is electrically connected to second lead with the 3rd grid.
In one embodiment of this invention, each electrostatic discharge protection circuit also comprises one second electrostatic discharge protection circuit unit, and wherein the second electrostatic discharge protection circuit unit comprises having ideals, morality, culture, and discipline source element, the 5th active element and the 6th active element.Having ideals, morality, culture, and discipline source element comprises the 4th source electrode, the 4th drain electrode and the 4th grid, and wherein the 4th source electrode and the 4th grid are electrically connected to second lead.The 5th active element comprises the 5th source electrode, the 5th drain electrode and the 5th grid, and wherein the 5th grid is electrically connected to second lead, and the 5th source electrode is electrically connected to the 4th drain electrode, and the 5th drain electrode is electrically connected to first lead.The 6th active element comprises the 6th source electrode, the 6th drain electrode and the 6th grid, and wherein the 6th source electrode is electrically connected to the 4th drain electrode and the 5th source electrode, and the 6th drain electrode is electrically connected to first lead with the 6th grid.
In one embodiment of this invention, first lead comprises holding wire, and holding wire comprises scan line or data wire.
In one embodiment of this invention, second lead comprises short-circuit rods.
The present invention proposes a kind of electrostatic discharge protection circuit in addition, and it electrically connects first lead and second lead, and electrostatic discharge protection circuit has the first electrostatic discharge protection circuit unit, and wherein the first electrostatic discharge protection circuit unit comprises first coupling capacitance and first active element.First coupling capacitance comprises first electrode and second electrode, and wherein first electrode is electrically connected to first lead.First active element comprises first grid, first source electrode and first drain electrode, and wherein the first grid and second electrode electrically connect, and first source electrode and first electrode and first lead electrically connect, and first drain electrode electrically connects with second lead.
In one embodiment of this invention, each electrostatic discharge protection circuit unit also comprises the second electrostatic discharge protection circuit unit, and the second electrostatic discharge protection circuit unit comprises second coupling capacitance and second active element.Second coupling capacitance comprises third electrode and the 4th electrode, and wherein third electrode is electrically connected to second lead.Second active element comprises second grid, second source electrode and second drain electrode, and wherein second grid and the 4th electrode electrically connect, and second source electrode and third electrode and second lead electrically connect, and second drain electrode electrically connects with first lead.
The present invention proposes a kind of electrostatic discharge protection circuit in addition, it is electrically connected to first lead and second lead, electrostatic discharge protection circuit has the first electrostatic discharge protection circuit unit, the first electrostatic discharge protection circuit unit comprises the circuit bank of a plurality of series connection, and each circuit bank comprises first coupling capacitance and first active element.First coupling capacitance comprises first electrode and second electrode.First active element comprises first grid, first source electrode and first drain electrode, wherein the first grid and second electrode electrically connect, first drain electrode of first source electrode and first electrode and upper level circuit bank electrically connects, first electrode of the first order of above-mentioned series circuit group and first lead electrically connect, and first drain electrode and second lead of the afterbody of series circuit group electrically connect.
In one embodiment of this invention, electrostatic discharge protection circuit also comprises the second electrostatic discharge protection circuit unit, and wherein the second electrostatic discharge protection circuit unit comprises second coupling capacitance and second active element.Second coupling capacitance comprises third electrode and the 4th electrode.Second active element comprises second grid, second source electrode and second drain electrode, wherein second grid and the 4th electrode electrically connect, second drain electrode of second source electrode and third electrode and upper level circuit bank electrically connects, the third electrode of the first order of above-mentioned series circuit group and second lead electrically connect, and second drain electrode and first lead of the afterbody of series circuit group electrically connect.
In one embodiment of this invention, first lead comprises holding wire, and holding wire is scan line or data wire.
In one embodiment of this invention, second lead is a short-circuit rods.
Electrostatic discharge protection circuit of the present invention unit has good electrostatic conducting efficient, electrostatic induced current can be done large-area dredging, and the interdependence of the ducting capacity of electrostatic discharge protection circuit of the present invention unit and the breadth length ratio value of active element is low, can jumbo reduction layout area.On the other hand, electrostatic discharge protection circuit of the present invention is made of two groups of identical electrostatic discharge protection circuit unit, has the function of two-way admittance, avoids active elements array substrates to suffer electrostatic breakdown, promotes yield.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Figure 1A is the schematic diagram of existing active elements array substrates.
Figure 1B～Fig. 1 C is respectively existing a kind of electrostatic discharge protection circuit schematic diagram.
Fig. 2 is the schematic diagram of a kind of active elements array substrates of the present invention.
Fig. 3 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.
Fig. 4 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.
Fig. 5 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.
The main element symbol description:
110,300: active elements array substrates
112,310: substrate
114: scan line
116: data wire
120,220,270: short-circuit rods
122: electrostatic discharge protection circuit
124: connection pad
118,320: pixel cell
200,250: electrostatic discharge protection circuit
210,260: holding wire
230,280: positive electrostatic defending group
240,290: negative electrostatic defending group
320a: active element
320b: pixel electrode
330: the first leads
340: the second leads
350,450,550: electrostatic discharge protection circuit
360A, 460A, 560A: the first electrostatic discharge protection circuit unit
360B, 460B, 560B: the second electrostatic discharge protection circuit unit
A: viewing area
B: perimeter circuit district
C1: first coupling capacitance
C2: second coupling capacitance
D: drain electrode
D1: first drain electrode
D2: second drain electrode
D3: the 3rd drain electrode
D4: the 4th source electrode
D5: the 5th source electrode
D6: the 6th source electrode
E1: first electrode
E2: third electrode
E3: third electrode
E4: the 4th electrode
G: grid
G1: first grid
G2: second grid
G3: the 3rd grid
G4: the 4th grid
G5: the 5th grid
G6: the 6th grid
S: source electrode
S1: first source electrode
S2: second source electrode
S3: the 3rd source electrode
S4: the 4th source electrode
S5: the 5th source electrode
S6: the 6th source electrode
T1: first active element
T2: second active element
T3: the 3rd active element
T4: having ideals, morality, culture, and discipline source element
T5: the 5th active element
T6: the 6th active element
U: circuit bank
Embodiment
Fig. 2 is the schematic diagram of a kind of active elements array substrates of the present invention.Please refer to Fig. 2, active elements array substrates 300 has a viewing area A and is positioned at the outer perimeter circuit district B of viewing area A, and active elements array substrates 300 comprises substrate 310, a plurality of pixel cell 320, many first leads 330, many second leads 340 and a plurality of electrostatic discharge protection circuits 350.A plurality of pixel cell 320 arrayed and are positioned at viewing area A on substrate 310, in general, each pixel cell 320 can comprise an at least one active element 320a and a pixel electrode 320b, and wherein active element 320a is electrically connected to pixel electrode 320b.Here be noted that, the design of the plain unit 320 of the number video of active element 320a and pixel electrode 320b and deciding, the pixel cell 320 that for example has precharge (Pre-charge) design may just need plural active element 320a, and may just need plural pixel electrode 320b at some pixel cells 320 that improve the colour cast design.Therefore, also be not intended to limit to the number of active element 320a and pixel electrode 320b in each pixel cell 320 at this.
As shown in Figure 2, many first leads 330 are disposed on the substrate 310, and are positioned at viewing area A, first lead 330 electrically connects with pixel cell 320, and extend to perimeter circuit district B, wherein first lead 330 for example is a holding wire, and holding wire can be scan line or data wire.Many second leads 340 are disposed on the substrate 310, and are positioned at perimeter circuit district B, and wherein second lead 340 for example is a short-circuit rods.In addition, a plurality of electrostatic discharge protection circuits 350 are disposed on the substrate 310, and are positioned at perimeter circuit district B, and wherein the electrostatic discharge protection circuit 350 and first lead 330 and second lead 340 electrically connect.
Fig. 3 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.Please refer to Fig. 3, electrostatic discharge protection circuit 350 is electrically connected to one first lead 330 and one second lead 340.Electrostatic discharge protection circuit 350 has one first electrostatic discharge protection circuit unit 360A, and the first electrostatic discharge protection circuit unit 360A comprises the first active element T1, the second active element T2 and the 3rd active element T3.It should be noted that, in the present embodiment, electrostatic discharge protection circuit 350 also comprises one second electrostatic discharge protection circuit unit 360B, wherein the second electrostatic discharge protection circuit unit 360B electrically connects first lead 330 and second lead 340, and the second electrostatic discharge protection circuit unit 360B comprises having ideals, morality, culture, and discipline source elements T 4, the 5th active element T5 and the 6th active element T6.
Particularly, the first electrostatic discharge protection circuit unit 360A comprises the first active element T1, the second active element T2 and the 3rd active element T3.The first active element T1 comprises first source S 1, first drain D 1 and first grid G1, and wherein first source S 1 is electrically connected to first lead 330 with first grid G1.The second active element T2 comprises second source S 2, second drain D 2 and second grid G2, and wherein second grid G2 is electrically connected to first lead, 330, the second source S 2 and is electrically connected to first drain D 1, and second drain D 2 is electrically connected to second lead 340.The 3rd active element T3 comprises the 3rd source S 3, the 3rd drain D 3 and the 3rd grid G 3, and wherein the 3rd source S 3 is electrically connected to first drain D 1 and second source S 2, and the 3rd drain D 3 and the 3rd grid G 3 are electrically connected to second lead 340.
On the other hand, the second electrostatic discharge protection circuit unit 360B comprises having ideals, morality, culture, and discipline source elements T 4, the 5th active element T5 and the 6th active element T6.Having ideals, morality, culture, and discipline source elements T 4 comprises the 4th source S 4, the 4th drain D 4 and the 4th grid G 4, and wherein the 4th source S 4 and the 4th grid G 4 are electrically connected to second lead 340.The 5th active element T5 comprises the 5th source S 5, the 5th drain D 5 and the 5th grid G 5, and wherein the 5th grid G 5 is electrically connected to second lead, 340, the five source S 5 and is electrically connected to the 4th drain D 4, and the 5th drain D 5 is electrically connected to first lead 330.The 6th active element T6 comprises the 6th source S 6, the 6th drain D 6 and the 6th grid G 6, and wherein the 6th source S 6 is electrically connected to the 4th drain D 4 and the 5th source S 5, and the 6th drain D 6 and the 6th grid G 6 are electrically connected to first lead.Here be noted that, active element T1, T2, T3, T4, T5, T6 for example are thin-film transistors, and each active element T1, T2, T3, T4, the pairing source S 1 of T5, T6, S2, S3, S4, S5, S6 and drain D 1, D2, D3, D4, D5, D6 decide on the thin-film transistor kind, also is not intended to limit to source S 1, S2, S3, S4, S5, S6 and drain D 1, D2, D3, D4, the D5 of each active element T1, T2, T3, T4, T5, T6, the position of D6 at this.
Specifically, in the present embodiment, the first electrostatic discharge protection circuit unit 360A is connected in series by three groups of active elements respectively with the second electrostatic discharge protection circuit unit 360B and is formed.With the first electrostatic discharge protection circuit unit 360A is example, the first electrostatic discharge protection circuit unit 360A is suitable for and will betides the electrostatic charge of first lead 330, by the path of the first active element T1, be passed to second lead 340 toward the second active element T2 or the 3rd active element T3.On the other hand, the second electrostatic discharge protection circuit unit 360B is suitable for and will betides the electrostatic charge of second lead 340, by the path of having ideals, morality, culture, and discipline source elements T 4 toward the 5th active element T5 or the 6th active element T6, is passed to first lead 330.In other words, in the present embodiment, electrostatic discharge protection circuit 350 has the function of two-way admittance.Certainly, electrostatic discharge protection circuit 350 also can only be made of the first electrostatic discharge protection circuit unit 360A.
In detail, please continue with reference to Fig. 3, when the static discharge phenomenon betides first lead 330, electrostatic charge can flow into the first electrostatic discharge protection circuit unit 360A earlier, the high pressure that static discharge moment is produced can be opened the first active element T1, and makes electrostatic charge flow to first drain D 1 by first source S 1.On the practice, the energy of electrostatic charge can be consumed after opening the first active element T1 effectively, makes the destructive power of static discharge reduce.If the energy of static discharge is very big, just can lower the destructive power of static discharge once more by the second active element T2.Afterwards, electrostatic charge can spread out by second lead 340, further to slow down the impact of static discharge.Owing to can be disperseed by the first electrostatic discharge protection circuit unit 360A earlier and consume from the electrostatic charge that first lead 330 comes.Therefore, each element that is connected with first lead 330, for example pixel cell 320 (being illustrated in Fig. 2) can avoid directly being subjected to static discharge to impact, and then can effectively prevent first lead 330 and other elements, and for example pixel cell 320 (being illustrated in Fig. 2) is short-circuited.For example; when first lead 330 and second lead 340 are respectively holding wire and short-circuit rods; the electrostatic charge that betides on the holding wire can dissipate to short-circuit rods with electrostatic charge by the first above-mentioned electrostatic discharge protection circuit unit 360A; go up each interior element of viewing area A with protection active elements array substrates 310 (being illustrated in Fig. 2); pixel cell 320 (being illustrated in Fig. 2) for example; keep the normal Presentation Function of picture, wherein holding wire can be a scan line, also can be data wire.
On the other hand, when the static discharge phenomenon betided second lead 340, electrostatic charge can flow into earlier the second electrostatic discharge protection circuit unit 360B, and the high pressure that static discharge moment is produced can be opened having ideals, morality, culture, and discipline source elements T 4 and the 5th active element T5 in regular turn.Afterwards, electrostatic charge can flow into first lead 330 via the having ideals, morality, culture, and discipline source elements T 4 and the 5th active element T5 that open, by first lead 330 electrostatic charge is spread out, further to slow down the impact of static discharge.Owing to can be disperseed by the second electrostatic discharge protection circuit unit 360B earlier and consume from the electrostatic charge that second lead 340 comes.Therefore, can avoid directly being subjected to static discharge to impact, and then can prevent effectively that second lead 340 is short-circuited with other elements with each element (not illustrating) that second lead 340 electrically connects.In other words, in the present embodiment, electrostatic discharge protection circuit 350 can be so that the electrostatic charge of first lead 330 and second lead 340 be done two-way mediation, to disperse the impact of static discharge to each element in the moment of static discharge phenomenon generation.
It should be noted that, the static dissipation path of the first electrostatic discharge protection circuit unit 360A comprises two active elements, in other words, after opening the first active element T1 and the second active element T2, static can reach the effect of mediation, therefore the static dissipation path compared to prior art comprises three active elements, the present invention has preferable electrostatic conducting efficient, so electrostatic protection effect is preferable.Following content will be simulated a kind of electrostatic discharge protection circuit 350 of the present invention and the simulation electrostatic induced current of existing electrostatic discharge protection circuit 200 (being illustrated in Figure 1B) under different active element breadth length ratio values.
Table one
Table one is electrostatic discharge protection circuit 350 and the electrostatic current of existing electrostatic discharge protection circuit 200 (being illustrated in Figure 1B) simulation when being in high electrostatic pressure.Please refer to table, when electrostatic charge is 200 volts, the electrostatic current of electrostatic discharge protection circuit 350 is about 4.4～4.7 milliamperes, electrostatic current size compared to 0.01～0.26 milliampere that has electrostatic discharge protection circuit now, electrostatic discharge protection circuit 350 has the effect of jumbo lifting electrostatic current conducting efficient, therefore compared to prior art, electrostatic discharge protection circuit 350 of the present invention has preferable static discahrge protection effect.In addition, by in the table one as can be known, the electrostatic current of electrostatic discharge protection circuit 350 is low for the interdependence of the breadth length ratio value of active element, be different from the interdependence height of the electrostatic discharge protection circuit of prior art to the breadth length ratio value of active element, need promote electrostatic current conducting efficient by the breadth length ratio value that increases active element, the electrostatic discharge protection circuit 350 in the present embodiment can significantly reduce the breadth length ratio value of active element.In other words, in the electrostatic discharge protection circuit 350 of the present invention, the breadth length ratio value of active element can reach preferable electrostatic conducting efficient with less design load, thereby significantly dwindles layout area.
Table two
Table two is the electrostatic current of electrostatic discharge protection circuit 350 simulation when being in low electrostatic pressure.As shown in Table 2, when electrostatic charge was 5 volts, the electrostatic current of electrostatic discharge protection circuit 350 was small.In other words, the electrostatic discharge protection circuit 350 of present embodiment does not have the excessive problem of leakage current under normal operating voltage.
In addition, in order further to promote the electro-static discharge protection function of electrostatic discharge protection circuit 350 of the present invention, in the first electrostatic discharge protection circuit unit 360A or the second electrostatic discharge protection circuit unit 360B, the 3rd active element T3 or the 6th active element T6 are set respectively, so that electrostatic discharge protection circuit 350 has the function of secondary protection.For example, when the second active element T2 of the first electrostatic discharge protection circuit unit 360A lost efficacy, the 3rd active element T3 can be used as the alternative route of electrostatic charge mediation, and making that electrostatic discharge protection circuit 350 still has the effect of dissipate it can't complete failure, guarantees the effect of electrostatic defending.
Fig. 4 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.Please refer to Fig. 4, electrostatic discharge protection circuit 450 is electrically connected to one first lead 430 and one second lead 440.Electrostatic discharge protection circuit 450 has the first electrostatic discharge protection circuit unit 460A, and the first electrostatic discharge protection circuit unit 460A comprises the first coupling capacitance C1 and the first active element T1, in addition, in the present embodiment, electrostatic discharge protection circuit 450 also comprises one second electrostatic discharge protection circuit unit 460B, and the second electrostatic discharge protection circuit unit 460B comprises the second coupling capacitance C2 and the second active element T2.
Particularly, the first electrostatic discharge protection circuit unit 460A comprises the first coupling capacitance C1 and the first active element T1.Wherein, the first coupling capacitance C1 comprises the first electrode E1 and the second electrode E2, and wherein the first electrode E1 is electrically connected to first lead 430.In addition, the first active element T1 comprises first grid G1, first source S 1 and first drain D 1, wherein the first grid G1 and the second electrode E2 electrically connect, and first source S 1 and the first electrode E1 and first lead 430 electrically connect, and first drain D 1 and second lead 440 electrically connect.
On the other hand, the second electrostatic discharge protection circuit unit 460B comprises the second coupling capacitance C2 and the second active element T2.The second coupling capacitance C2 comprises third electrode E3 and the 4th electrode E4, and wherein third electrode E3 is electrically connected to second lead 440.The second active element T2 comprises second grid G2, second source S 2 and second drain D 2, wherein second grid G2 and the 4th electrode E4 electrically connect, second source S 2 electrically connects with the third electrode E3 and second lead 440, and second drain D 2 and first lead 430 electrically connect.Similarly, active element T1, T2 for example are thin-film transistors, and the pairing source S 1 of active element T1, T2, S2 and drain D 1, D2 look closely the thin-film transistor kind and decide, and also is not intended to limit to source S 1, S2 and the drain D 1 among active element T1, the T2, the allocation position of D2 at this.
In detail, in the present embodiment, the first electrostatic discharge protection circuit unit 460A is connected in series by one group of coupling capacitance and one group of active element respectively with the second electrostatic discharge protection circuit unit 460B and is formed.With the first electrostatic discharge protection circuit unit 460A is example, and the first electrostatic discharge protection circuit unit 460A is suitable for and will betides the electrostatic charge of first lead 430, by the path of the first coupling capacitance C1 toward the first active element T1, is passed to second lead 440.On the other hand, the second electrostatic discharge protection circuit unit 460B is suitable for and will betides the electrostatic charge of second lead 440, by the path of the second coupling capacitance C2 toward the second active element T2, is passed to first lead 430.In other words, in the present embodiment, electrostatic discharge protection circuit 450 has the function of two-way admittance.Certainly, electrostatic discharge protection circuit 450 also can only be made of the first electrostatic discharge protection circuit unit 460A.
Please continue with reference to Fig. 4, when the static discharge phenomenon betides first lead 430, electrostatic charge can flow into the first electrostatic discharge protection circuit unit 460A of top earlier, specifically, the first coupling capacitance C1 among the first electrostatic discharge protection circuit unit 460A is when the static discharge phenomenon takes place, can increase by the conducting efficient of the first active element T1 effectively, make and form a voltage difference between the first grid G1 of the active element T1 that wins and first source S 1, to open the first active element T1, and then with electrostatic charge moment ground by first source S 1 toward the 1 direction transmission of first drain D, and electrostatic charge evacuated toward second lead 440, further to slow down the impact of static discharge.
On the practice, the energy of electrostatic charge can be consumed after opening the first coupling capacitance C1 and the first active element T1 effectively, makes the destructive power of static discharge reduce.Therefore, each element that is connected with first lead 430, for example pixel cell 320 (being illustrated in Fig. 2) can avoid directly being subjected to static discharge to impact, and then can prevent effectively that first lead 430 is short-circuited with other elements, for example pixel cell 320 (being illustrated in Fig. 2).For example; when first lead 430 and second lead 440 are respectively holding wire and short-circuit rods; the electrostatic charge that betides on the holding wire can dissipate to short-circuit rods with electrostatic charge by the first above-mentioned electrostatic discharge protection circuit unit 460A; go up each interior element of viewing area A with protection active elements array substrates 310 (being illustrated in Fig. 2); pixel cell 320 (being illustrated in Fig. 2) for example; keep the normal Presentation Function of picture, wherein holding wire can be a scan line, also can be data wire.
When the static discharge phenomenon betides second lead 440, electrostatic charge can flow into the second electrostatic discharge protection circuit unit 460B of below, in like manner, electrostatic charge is similar to the above toward the static dissipation path that first lead 430 spreads out via the second electrostatic discharge protection circuit unit 460B, is not repeated.
It should be noted that, coupling capacitance C1, C2 among each electrostatic discharge protection circuit unit 460A, 460B can assist active element T1, T2 when static discharge takes place unlatching, in other words, the electrostatic discharge protection circuit 450 of present embodiment has preferable electrostatic conducting efficient compared to the electrostatic discharge protection circuit 250 (being illustrated in Fig. 1 C) of prior art.Table three is a kind of electrostatic discharge protection circuit 450 and the simulation electrostatic induced current of existing electrostatic discharge protection circuit 250 (being illustrated in Fig. 1 C) under identical active element breadth length ratio value of present embodiment.
Table three
| Electrostatic current (ampere) | 2000 |
4 volts |
| Electrostatic |
16.35 | 82.09E-9 |
| Electrostatic |
0.183 | 12.19E-9 |
Please refer to table three, when electrostatic charge is 2000 volts, the size of the electrostatic current of the electrostatic discharge protection circuit 450 of present embodiment is about 100 times of existing electrostatic discharge protection circuit 250, so the electrostatic discharge protection circuit 450 of present embodiment has the effect of jumbo lifting electrostatic current conducting efficient.In addition, by in the table three as can be known, under normal operating voltage, electrostatic discharge protection circuit 450 there is no the excessive problem of electrostatic current, therefore the electrostatic discharge protection circuit 450 of present embodiment can effectively avoid active elements array substrates to suffer electrostatic breakdown under the normal running that does not influence picture.Compared to prior art, present embodiment need not increase under the situation of active element breadth length ratio value, can effectively electrostatic charge be evacuated, in other words, can reach preferable electrostatic conducting efficient with less active element breadth length ratio value design in the electrostatic discharge protection circuit 450 of the present invention, thereby significantly dwindle layout area.
What deserves to be mentioned is that above-mentioned coupling capacitance C1, C2 and the combination of active element T1, T2 can be considered as set of circuits group U respectively.On the practice, if the energy of static discharge is very big, can be in each electrostatic discharge protection circuit 460A, 460B, the circuit bank U of the many group series connection of configuration, as shown in Figure 5, each electrostatic discharge protection circuit 460A, 460B are respectively to be that example explains with two groups of circuit bank U.
Specifically, Fig. 5 is the schematic diagram of a kind of electrostatic discharge protection circuit of the present invention.Please refer to Fig. 5, electrostatic discharge protection circuit 550 is similar with electrostatic discharge protection circuit 450, the electrostatic discharge protection circuit 550 of present embodiment has the first electrostatic discharge protection circuit unit 560A, wherein the first electrostatic discharge protection circuit unit 560A is made up of the many groups of circuit bank that are one another in series, and wherein each circuit bank U comprises the first coupling capacitance C1 and the first active element T1 respectively.The first coupling capacitance C1 comprises the first electrode E1 and the second electrode E2.The first active element T1 comprises first grid G1, first source S 1 and first drain D 1, wherein the first grid G1 and the second electrode E2 electrically connect, first drain D 1 of first source S 1 and the first electrode E1 and upper level circuit bank electrically connects, the first electrode E1 of the first order of above-mentioned series circuit group and first lead 430 electrically connect, and first drain D 1 of the afterbody of series circuit group and second lead 440 electrically connect.
On the other hand, in the present embodiment, electrostatic discharge protection circuit 550 also comprises the second electrostatic discharge protection circuit unit 560B, and wherein the second electrostatic discharge protection circuit unit 560B comprises the second coupling capacitance C2 and the second active element T2.The second coupling capacitance C2 comprises third electrode E3 and the 4th electrode E4.The second active element T2 comprises second grid G2, second source S 2 and second drain D 2, wherein second grid G2 and the 4th electrode E4 electrically connect, second source S 2 electrically connects with second drain D 2 of third electrode E3 and upper level circuit bank, the third electrode E3 of the first order of above-mentioned series circuit group and second lead 440 electrically connect, and second drain D 2 of the afterbody of series circuit group and first lead 430 electrically connect.
Please continue with reference to Fig. 5, when static discharge betides first lead, 430 sides, electrostatic charge can spread out toward second lead 440 via the first electrostatic discharge protection circuit unit, in detail, the energy of electrostatic charge can be consumed behind the first coupling capacitance C1 that opens first order circuit bank U1 and the first active element T1 effectively, makes the destructive power of static discharge reduce.If the energy of static discharge is very big, just can be again the first coupling capacitance C1 by next stage circuit bank U2 and the first active element T1 and lower the destructive power of static discharge once more.Make the electrostatic charge that betides first lead, 430 sides to spread out toward second lead 440 via the first electrostatic discharge protection circuit unit 560A, on the other hand, the electrostatic charge that betides second lead, 440 sides can be via the second electrostatic discharge protection circuit unit 560B spread out toward first lead 430, further to slow down the impact of static discharge to each element that (is illustrated in Fig. 2) on the substrate.
In sum, electrostatic discharge protection circuit of the present invention has good electrostatic conducting efficient, electrostatic induced current can be done large-area dredging, and the ducting capacity of electrostatic discharge protection circuit of the present invention unit more is not subjected to the influence of the breadth length ratio value of active element, can jumbo reduction layout area.Moreover electrostatic discharge protection circuit of the present invention has the function of two-way admittance, can effectively avoid active elements array substrates to suffer electrostatic breakdown, promotes yield.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (10)
1. electrostatic discharge protection circuit, it is electrically connected to one first lead and one second lead, and this electrostatic discharge protection circuit has one first electrostatic discharge protection circuit unit, and wherein this first electrostatic discharge protection circuit unit comprises:
One first active element comprises one first source electrode, one first drain electrode and a first grid, and wherein this first source electrode and this first grid are electrically connected to this first lead;
One second active element comprises one second source electrode, one second drain electrode and a second grid, and wherein this second grid is electrically connected to this first lead, and this second source electrode is electrically connected to this first drain electrode, and this second drain electrode is electrically connected to this second lead; And
One the 3rd active element comprises one the 3rd source electrode, one the 3rd drain electrode and one the 3rd grid, and wherein the 3rd source electrode is electrically connected to this first drain electrode and this second source electrode, and the 3rd drain electrode is electrically connected to this second lead with the 3rd grid.
2. electrostatic discharge protection circuit as claimed in claim 1 is characterized in that, also comprises one second electrostatic discharge protection circuit unit, and wherein this second electrostatic discharge protection circuit unit comprises:
One having ideals, morality, culture, and discipline source element comprises one the 4th source electrode, one the 4th drain electrode and one the 4th grid, and wherein the 4th source electrode and the 4th grid are electrically connected to this second lead;
One the 5th active element comprises one the 5th source electrode, one the 5th drain electrode and one the 5th grid, and wherein the 5th grid is electrically connected to this second lead, and the 5th source electrode is electrically connected to the 4th drain electrode, and the 5th drain electrode is electrically connected to this first lead; And
One the 6th active element comprises one the 6th source electrode, one the 6th drain electrode and one the 6th grid, and wherein the 6th source electrode is electrically connected to the 4th drain electrode and the 5th source electrode, and the 6th drain electrode is electrically connected to this first lead with the 6th grid.
3. electrostatic discharge protection circuit as claimed in claim 1 is characterized in that, this first lead comprises holding wire.
4. electrostatic discharge protection circuit as claimed in claim 3 is characterized in that this holding wire comprises scan line or data wire.
5. electrostatic discharge protection circuit as claimed in claim 1 is characterized in that, this second lead comprises short-circuit rods.
6. active elements array substrates has a viewing area and is positioned at a perimeter circuit district outside this viewing area, and this active elements array substrates comprises:
One substrate;
A plurality of pixel cells, arrayed and are positioned at this viewing area on this substrate;
Many first leads are disposed on this substrate, and are positioned at this viewing area, and those first leads and those pixel cells electrically connect, and extend to this perimeter circuit district;
Many second leads are disposed on this substrate, and are positioned at this perimeter circuit district;
A plurality of electrostatic discharge protection circuits, be disposed on this substrate, and be positioned at this perimeter circuit district, those electrostatic discharge protection circuits are electrically connected to those first leads and those second leads, respectively this electrostatic discharge protection circuit has one first electrostatic discharge protection circuit unit, and wherein this first electrostatic discharge protection circuit unit comprises:
One first active element comprises one first source electrode, one first drain electrode and a first grid, and wherein this first source electrode and this first grid are electrically connected to this first lead;
One second active element comprises one second source electrode, one second drain electrode and a second grid, and wherein this second grid is electrically connected to this first lead, and this second source electrode is electrically connected to this first drain electrode, and this second drain electrode is electrically connected to this second lead; And
One the 3rd active element comprises one the 3rd source electrode, one the 3rd drain electrode and one the 3rd grid, and wherein the 3rd source electrode is electrically connected to this first drain electrode and this second source electrode, and the 3rd drain electrode is electrically connected to this second lead with the 3rd grid.
7. active elements array substrates as claimed in claim 6 is characterized in that, respectively this electrostatic discharge protection circuit also comprises one second electrostatic discharge protection circuit unit, and this second electrostatic discharge protection circuit unit comprises:
One having ideals, morality, culture, and discipline source element comprises one the 4th source electrode, one the 4th drain electrode and one the 4th grid, and wherein the 4th source electrode and the 4th grid are electrically connected to this second lead;
One the 5th active element comprises one the 5th source electrode, one the 5th drain electrode and one the 5th grid, and wherein the 5th grid is electrically connected to this second lead, and the 5th source electrode is electrically connected to the 4th drain electrode, and the 5th drain electrode is electrically connected to this first lead; And
One the 6th active element comprises one the 6th source electrode, one the 6th drain electrode and one the 6th grid, and wherein the 6th source electrode is electrically connected to the 4th drain electrode and the 5th source electrode, and the 6th drain electrode is electrically connected to this first lead with the 6th grid.
8. active elements array substrates as claimed in claim 6 is characterized in that, this first lead comprises holding wire.
9. active elements array substrates as claimed in claim 8 is characterized in that this holding wire comprises scan line or data wire.
10. active elements array substrates as claimed in claim 6 is characterized in that, this second lead comprises short-circuit rods.
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| CN2008100879653A CN101546907B (en) | 2008-03-25 | 2008-03-25 | Electrostatic protection circuit and active-element array substrate |
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| CN2008100879653A CN101546907B (en) | 2008-03-25 | 2008-03-25 | Electrostatic protection circuit and active-element array substrate |
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| CN2010105904470A Division CN102013675A (en) | 2008-03-25 | 2008-03-25 | Antistatic circuit |
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| CN101546907B true CN101546907B (en) | 2011-09-14 |
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| CN104681631B (en) * | 2015-03-24 | 2019-04-30 | 京东方科技集团股份有限公司 | Thin film transistor and its manufacturing method, array substrate and display device |
| CN105404035A (en) * | 2015-12-08 | 2016-03-16 | 昆山龙腾光电有限公司 | Liquid crystal display panel |
| CN106652822A (en) * | 2017-02-28 | 2017-05-10 | 深圳市华星光电技术有限公司 | Array basal plate and light-emitting diode display |
| CN111443541B (en) * | 2020-04-09 | 2022-09-23 | 昆山龙腾光电股份有限公司 | Discharge protection circuit and display panel |
| TW202332072A (en) * | 2022-01-19 | 2023-08-01 | 友達光電股份有限公司 | Sensing device |
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| CN1864331A (en) * | 2003-09-26 | 2006-11-15 | 英飞凌科技股份公司 | Integrated circuit with electrostatic discharge protection |
| CN101064984A (en) * | 2006-04-29 | 2007-10-31 | 中华映管股份有限公司 | Electrostatic discharge safeguard structure |
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| US6118640A (en) * | 1999-02-17 | 2000-09-12 | Pericom Semiconductor Corp. | Actively-driven thin-oxide MOS transistor shunt for ESD protection of multiple independent supply busses in a mixed-signal chip |
| CN1864331A (en) * | 2003-09-26 | 2006-11-15 | 英飞凌科技股份公司 | Integrated circuit with electrostatic discharge protection |
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